package cn.com.adcc.miamacfinter.aid.utils;

/**
 * Created by Fzy on 2014/7/31.
 */

import java.io.*;

public class CRC_Calculate {

    private final static int table[]={

            0x00000000,0x04c11db7,0x09823b6e,0x0d4326d9,0x130476dc,0x17c56b6b,0x1a864db2,0x1e475005,
            0x2608edb8,0x22c9f00f,0x2f8ad6d6,0x2b4bcb61,0x350c9b64,0x31cd86d3,0x3c8ea00a,0x384fbdbd,
            0x4c11db70,0x48d0c6c7,0x4593e01e,0x4152fda9,0x5f15adac,0x5bd4b01b,0x569796c2,0x52568b75,
            0x6a1936c8,0x6ed82b7f,0x639b0da6,0x675a1011,0x791d4014,0x7ddc5da3,0x709f7b7a,0x745e66cd,
            0x9823b6e0,0x9ce2ab57,0x91a18d8e,0x95609039,0x8b27c03c,0x8fe6dd8b,0x82a5fb52,0x8664e6e5,
            0xbe2b5b58,0xbaea46ef,0xb7a96036,0xb3687d81,0xad2f2d84,0xa9ee3033,0xa4ad16ea,0xa06c0b5d,
            0xd4326d90,0xd0f37027,0xddb056fe,0xd9714b49,0xc7361b4c,0xc3f706fb,0xceb42022,0xca753d95,
            0xf23a8028,0xf6fb9d9f,0xfbb8bb46,0xff79a6f1,0xe13ef6f4,0xe5ffeb43,0xe8bccd9a,0xec7dd02d,
            0x34867077,0x30476dc0,0x3d044b19,0x39c556ae,0x278206ab,0x23431b1c,0x2e003dc5,0x2ac12072,
            0x128e9dcf,0x164f8078,0x1b0ca6a1,0x1fcdbb16,0x018aeb13,0x054bf6a4,0x0808d07d,0x0cc9cdca,
            0x7897ab07,0x7c56b6b0,0x71159069,0x75d48dde,0x6b93dddb,0x6f52c06c,0x6211e6b5,0x66d0fb02,
            0x5e9f46bf,0x5a5e5b08,0x571d7dd1,0x53dc6066,0x4d9b3063,0x495a2dd4,0x44190b0d,0x40d816ba,
            0xaca5c697,0xa864db20,0xa527fdf9,0xa1e6e04e,0xbfa1b04b,0xbb60adfc,0xb6238b25,0xb2e29692,
            0x8aad2b2f,0x8e6c3698,0x832f1041,0x87ee0df6,0x99a95df3,0x9d684044,0x902b669d,0x94ea7b2a,
            0xe0b41de7,0xe4750050,0xe9362689,0xedf73b3e,0xf3b06b3b,0xf771768c,0xfa325055,0xfef34de2,
            0xc6bcf05f,0xc27dede8,0xcf3ecb31,0xcbffd686,0xd5b88683,0xd1799b34,0xdc3abded,0xd8fba05a,
            0x690ce0ee,0x6dcdfd59,0x608edb80,0x644fc637,0x7a089632,0x7ec98b85,0x738aad5c,0x774bb0eb,
            0x4f040d56,0x4bc510e1,0x46863638,0x42472b8f,0x5c007b8a,0x58c1663d,0x558240e4,0x51435d53,
            0x251d3b9e,0x21dc2629,0x2c9f00f0,0x285e1d47,0x36194d42,0x32d850f5,0x3f9b762c,0x3b5a6b9b,
            0x0315d626,0x07d4cb91,0x0a97ed48,0x0e56f0ff,0x1011a0fa,0x14d0bd4d,0x19939b94,0x1d528623,
            0xf12f560e,0xf5ee4bb9,0xf8ad6d60,0xfc6c70d7,0xe22b20d2,0xe6ea3d65,0xeba91bbc,0xef68060b,
            0xd727bbb6,0xd3e6a601,0xdea580d8,0xda649d6f,0xc423cd6a,0xc0e2d0dd,0xcda1f604,0xc960ebb3,
            0xbd3e8d7e,0xb9ff90c9,0xb4bcb610,0xb07daba7,0xae3afba2,0xaafbe615,0xa7b8c0cc,0xa379dd7b,
            0x9b3660c6,0x9ff77d71,0x92b45ba8,0x9675461f,0x8832161a,0x8cf30bad,0x81b02d74,0x857130c3,
            0x5d8a9099,0x594b8d2e,0x5408abf7,0x50c9b640,0x4e8ee645,0x4a4ffbf2,0x470cdd2b,0x43cdc09c,
            0x7b827d21,0x7f436096,0x7200464f,0x76c15bf8,0x68860bfd,0x6c47164a,0x61043093,0x65c52d24,
            0x119b4be9,0x155a565e,0x18197087,0x1cd86d30,0x029f3d35,0x065e2082,0x0b1d065b,0x0fdc1bec,
            0x3793a651,0x3352bbe6,0x3e119d3f,0x3ad08088,0x2497d08d,0x2056cd3a,0x2d15ebe3,0x29d4f654,
            0xc5a92679,0xc1683bce,0xcc2b1d17,0xc8ea00a0,0xd6ad50a5,0xd26c4d12,0xdf2f6bcb,0xdbee767c,
            0xe3a1cbc1,0xe760d676,0xea23f0af,0xeee2ed18,0xf0a5bd1d,0xf464a0aa,0xf9278673,0xfde69bc4,
            0x89b8fd09,0x8d79e0be,0x803ac667,0x84fbdbd0,0x9abc8bd5,0x9e7d9662,0x933eb0bb,0x97ffad0c,
            0xafb010b1,0xab710d06,0xa6322bdf,0xa2f33668,0xbcb4666d,0xb8757bda,0xb5365d03,0xb1f740b4
    };

    public static short CRC618(byte[] bytes)
    {
        short bitMask = (short)0x8000;
        short regi = 0;
        for (int i = 0; i < bytes.length; i++)
        {
            regi ^= (short)(ReverseBitsByte(OddParityByte(bytes[i])) << 8);
            for (int j = 0; j < 8; j++)
            {
                if ((regi & bitMask) != 0)
                    regi = (short)(regi << 1 ^ 0x1021);
                else
                    regi <<= 1;
            }
        }
        regi = (short)ReverseBitsInt16(regi);
        return regi;
    }

    public static short CRC655_16(byte[] bytes, byte[] hex)
    {
        byte[] buffer = new byte[bytes.length + hex.length];
        System.arraycopy(bytes,0,buffer,0,bytes.length);
        System.arraycopy(hex,0,buffer,bytes.length,hex.length);
        short bitMask = -32768;
        short register = -1;
        for (int i = 0; i < buffer.length; i++)
        {
            byte element = buffer[i];
            register ^= (short)(element << 8);
            for (int j = 0; j < 8; j++)
                if ((register & bitMask) != 0)
                    register = (short)(register << 1 ^ 0x1021);
                else
                    register <<= 1;
        }
        return register;
    }

    public static short CRC622(byte[] bytes, byte[] hex)
    {
        byte[] buffer = new byte[bytes.length + hex.length];
        System.arraycopy(bytes,0,buffer,0,bytes.length);
        System.arraycopy(hex,0,buffer,bytes.length,hex.length);
        short bitMask = -32768;
        short register = -1;
        for (int i = 0; i < buffer.length; i++)
        {
            byte element = buffer[i];
            register ^= (short)(element << 8);
            for (int j = 0; j < 8; j++)
                if ((register & bitMask) != 0)
                    register = (short)(register << 1 ^ 0x1021);
                else
                    register <<= 1;
        }
        register ^= -1;
        return register;
    }

    public static short CRC429(byte[] bytes, byte[] hex)
    {
        return ((short) ReverseAllBitsInt(CRC622(bytes, hex)));
    }

    //参数str为文件完整路径
    public static long CRC32_s(String str) throws IOException,ClassNotFoundException
    {

        long CRC_value = 0xFFFFFFFF;
        byte[] sBuffer = new byte[1024];
        // 初始化CRC值
        try {
            DataInputStream ds = new DataInputStream(new BufferedInputStream(new FileInputStream(str)));

            try {
                while (ds.available() != 0){

                    int num = 0;
                    for (int i = 0; i < sBuffer.length; i++) {
                        try {
                            sBuffer[i] = ds.readByte();
                            num++;
                        }
                        catch (IOException e) {
                            break;
                        }
                    }
                    byte[] bf = new byte[num];
                    for (int i = 0; i < num; i++) {
                        bf[i] = sBuffer[i];
                    }
                    int nb = bf.length;
                    // If any bytes were read, compute the running CRC_value
                    // for them
                    if (nb > 0) {
                        CRC_value=CRCBuffer(nb,CRC_value,sBuffer);
                    }
                }
                // Apply XorOut
                CRC_value ^= 0xFFFFFFFF;
                // Close FILENAME
                ds.close();
            }
            catch (IOException e) {
                e.printStackTrace();
            }
        }
        catch(FileNotFoundException e){
            e.printStackTrace();
        }
        return CRC_value;
    }

    private static long CRCBuffer(int nb,long CRC_value,byte[] sBuffer)
    {
        long i; // Byte index into buffer
        long k; // Index into look-up table
        // Loop for each byte in Buffer
        for (i = 0; i < nb; i++){
            // Compute index into look-up table for the current byte
            k = ((CRC_value >> 24) ^ sBuffer[(int)i]) & 0xFF;
            // Update the running CRC_value for the curtrent byte
            CRC_value = (CRC_value << 8) ^ (table[(int)k]);
        }
        return CRC_value;
    }

    //设置最高位为奇校验
    private static byte OddParityByte(byte value)
    {
        int data = value >> 4 ^ value;
        data = data >> 2 ^ data;
        data = (data >> 1 ^ data) & 0x01;
        if (data == 0){
            return (byte)(value ^ 0x80);
        }
        return value;
    }

    //反转字节的高低位
    private static byte ReverseBitsByte(int valu)
    {
        //每一位相互交换	12345678 -> 21436587
        valu = (valu & 0x55) << 1 | (valu & 0xAA) >> 1;
        //每两位相互交换	21436587 -> 43218765
        valu = (valu & 0x33) << 2 | (valu & 0xCC) >> 2;
        //每四位相互交换	43218765 -> 87654321
        return (byte)(valu << 4 | valu >> 4);
    }

    //反转字节的高低位
    private static int ReverseBitsInt16(int value)
    {
        //每一位相互交换	FEDC BA98 7654 3210 -> EFCD AB89 6745 2301
        value = (value & 0x5555) << 1 | (value & 0xAAAA) >> 1;
        //每两位相互交换	EFCD AB89 6745 2301 -> CDEF 89AB 4567 0123
        value = (value & 0x3333) << 2 | (value & 0xCCCC) >> 2;
        //每四位相互交换	CDEF 89AB 4567 0123 -> 89AB CDEF 0123 4567
        return (value & 0x0F0F) << 4 | (value & 0xF0F0) >> 4;
    }

    //反转整体高低位
    private static int ReverseAllBitsInt(int value)
    {
        //每一位相互交换	FEDC BA98 7654 3210 -> EFCD AB89 6745 2301
        value = (value & 0x5555) << 1 | (value & 0xAAAA) >> 1;
        //每两位相互交换	EFCD AB89 6745 2301 -> CDEF 89AB 4567 0123
        value = (value & 0x3333) << 2 | (value & 0xCCCC) >> 2;
        //每四位相互交换	CDEF 89AB 4567 0123 -> 89AB CDEF 0123 4567
        value = (value & 0x0F0F) << 4 | (value & 0xF0F0) >> 4;
        //每八位相互交换
        return (value & 0xFFFF) << 8 | (value & 0xFFFF) >> 8;
    }

}
